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-- ldgallery - A static generator which turns a collection of tagged
-- pictures into a searchable web gallery.
--
-- Copyright (C) 2019-2020 Pacien TRAN-GIRARD
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as
-- published by the Free Software Foundation, either version 3 of the
-- License, or (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program. If not, see <https://www.gnu.org/licenses/>.
module Processors
( Resolution(..)
, ItemFileProcessor, itemFileProcessor
, ThumbnailFileProcessor, thumbnailFileProcessor
, skipCached, withCached
) where
import Control.Exception (Exception, throwIO)
import Data.Function ((&))
import Data.Ratio ((%))
import Data.Char (toLower)
import System.Directory hiding (copyFile)
import qualified System.Directory
import System.FilePath
import Codec.Picture
import Codec.Picture.Extra -- TODO: compare DCT and bilinear (and Lanczos, but it's not implemented)
import Resource
( ItemProcessor, ThumbnailProcessor
, GalleryItemProps(..), Resolution(..), Resource(..) )
import Files
data ProcessingException = ProcessingException FilePath String deriving Show
instance Exception ProcessingException
data PictureFileFormat = Bmp | Jpg | Png | Tiff | Hdr | Gif
-- TODO: handle video, music, text...
data Format = PictureFormat PictureFileFormat | Unknown
formatFromPath :: Path -> Format
formatFromPath =
maybe Unknown fromExt
. fmap (map toLower)
. fmap takeExtension
. fileName
where
fromExt :: String -> Format
fromExt ".bmp" = PictureFormat Bmp
fromExt ".jpg" = PictureFormat Jpg
fromExt ".jpeg" = PictureFormat Jpg
fromExt ".png" = PictureFormat Png
fromExt ".tiff" = PictureFormat Tiff
fromExt ".hdr" = PictureFormat Hdr
fromExt ".gif" = PictureFormat Gif
fromExt _ = Unknown
type FileProcessor =
FileName -- ^ Input path
-> FileName -- ^ Output path
-> IO ()
copyFileProcessor :: FileProcessor
copyFileProcessor inputPath outputPath =
(putStrLn $ "Copying:\t" ++ outputPath)
>> ensureParentDir (flip System.Directory.copyFile) outputPath inputPath
type LossyExportQuality = Int
type StaticImageReader = FilePath -> IO (Either String DynamicImage)
type StaticImageWriter = FilePath -> DynamicImage -> IO ()
resizeStaticImageUpTo :: Resolution -> LossyExportQuality -> PictureFileFormat -> FileProcessor
resizeStaticImageUpTo maxResolution jpegExportQuality pictureFormat =
resizerFor pictureFormat
where
resizerFor :: PictureFileFormat -> FileProcessor
resizerFor Bmp = resizer readBitmap saveBmpImage
resizerFor Jpg = resizer readJpeg (saveJpgImage jpegExportQuality)
resizerFor Png = resizer readPng savePngImage
resizerFor Tiff = resizer readTiff saveTiffImage
resizerFor Hdr = resizer readHDR saveRadianceImage
resizerFor Gif = resizer readGif saveGifImage'
where
saveGifImage' :: StaticImageWriter
saveGifImage' outputPath image =
saveGifImage outputPath image
& either (throwIO . ProcessingException outputPath) id
resizer :: StaticImageReader -> StaticImageWriter -> FileProcessor
resizer reader writer inputPath outputPath =
(putStrLn $ "Generating:\t" ++ outputPath)
>> reader inputPath
>>= either (throwIO . ProcessingException inputPath) return
>>= return . (fitDynamicImage maxResolution)
>>= ensureParentDir writer outputPath
fitDynamicImage :: Resolution -> DynamicImage -> DynamicImage
fitDynamicImage (Resolution boxWidth boxHeight) image =
convertRGBA8 image
& scaleBilinear targetWidth targetHeight
& ImageRGBA8
where
picWidth = dynamicMap imageWidth image
picHeight = dynamicMap imageHeight image
resizeRatio = min (boxWidth % picWidth) (boxHeight % picHeight)
targetWidth = floor $ resizeRatio * (picWidth % 1)
targetHeight = floor $ resizeRatio * (picHeight % 1)
type Cache = FileProcessor -> FileProcessor
skipCached :: Cache
skipCached processor inputPath outputPath =
removePathForcibly outputPath
>> processor inputPath outputPath
withCached :: Cache
withCached processor inputPath outputPath =
do
isDir <- doesDirectoryExist outputPath
if isDir then removePathForcibly outputPath else noop
fileExists <- doesFileExist outputPath
if fileExists then
do
needUpdate <- isOutdated True inputPath outputPath
if needUpdate then update else skip
else
update
where
noop = return ()
update = processor inputPath outputPath
skip = putStrLn $ "Skipping:\t" ++ outputPath
resourceAt :: FilePath -> Path -> IO Resource
resourceAt fsPath resPath = getModificationTime fsPath >>= return . Resource resPath
type ItemFileProcessor =
FileName -- ^ Input base path
-> FileName -- ^ Output base path
-> FileName -- ^ Output class (subdir)
-> ItemProcessor
itemFileProcessor :: Maybe Resolution -> LossyExportQuality -> Cache -> ItemFileProcessor
itemFileProcessor maxResolution jpegExportQuality cached inputBase outputBase resClass inputRes =
cached processor inPath outPath
>> resourceAt outPath relOutPath
>>= return . props
where
relOutPath = resClass /> inputRes
inPath = localPath $ inputBase /> inputRes
outPath = localPath $ outputBase /> relOutPath
(processor, props) = processorFor maxResolution $ formatFromPath inputRes
processorFor :: Maybe Resolution -> Format -> (FileProcessor, Resource -> GalleryItemProps)
processorFor Nothing _ =
(copyFileProcessor, Other)
processorFor _ (PictureFormat Gif) =
(copyFileProcessor, Picture) -- TODO: handle animated gif resizing
processorFor (Just maxRes) (PictureFormat picFormat) =
(resizeStaticImageUpTo maxRes jpegExportQuality picFormat, Picture)
processorFor _ Unknown =
(copyFileProcessor, Other) -- TODO: handle video reencoding and others?
type ThumbnailFileProcessor =
FileName -- ^ Input base path
-> FileName -- ^ Output base path
-> FileName -- ^ Output class (subdir)
-> ThumbnailProcessor
thumbnailFileProcessor :: Resolution -> LossyExportQuality -> Cache -> ThumbnailFileProcessor
thumbnailFileProcessor maxRes jpegExportQuality cached inputBase outputBase resClass inputRes =
cached <$> processorFor (formatFromPath inputRes)
& process
where
relOutPath = resClass /> inputRes
inPath = localPath $ inputBase /> inputRes
outPath = localPath $ outputBase /> relOutPath
process :: Maybe FileProcessor -> IO (Maybe Resource)
process Nothing = return Nothing
process (Just proc) =
proc inPath outPath
>> resourceAt outPath relOutPath
>>= return . Just
processorFor :: Format -> Maybe FileProcessor
processorFor (PictureFormat picFormat) =
Just $ resizeStaticImageUpTo maxRes jpegExportQuality picFormat
processorFor _ =
Nothing
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